1/*- 2 * Copyright (c) 2014 John Baldwin 3 * Copyright (c) 2014, 2016 The FreeBSD Foundation 4 * 5 * Portions of this software were developed by Konstantin Belousov 6 * under sponsorship from the FreeBSD Foundation. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 */ 29 30#include <sys/cdefs.h> 31__FBSDID("$FreeBSD: stable/11/sys/kern/kern_procctl.c 352125 2019-09-10 07:29:21Z kib $"); 32 33#include <sys/param.h> 34#include <sys/systm.h> 35#include <sys/capsicum.h> 36#include <sys/lock.h> 37#include <sys/mutex.h> 38#include <sys/priv.h> 39#include <sys/proc.h> 40#include <sys/procctl.h> 41#include <sys/sx.h> 42#include <sys/syscallsubr.h> 43#include <sys/sysproto.h> 44#include <sys/wait.h> 45 46static int 47protect_setchild(struct thread *td, struct proc *p, int flags) 48{ 49 50 PROC_LOCK_ASSERT(p, MA_OWNED); 51 if (p->p_flag & P_SYSTEM || p_cansched(td, p) != 0) 52 return (0); 53 if (flags & PPROT_SET) { 54 p->p_flag |= P_PROTECTED; 55 if (flags & PPROT_INHERIT) 56 p->p_flag2 |= P2_INHERIT_PROTECTED; 57 } else { 58 p->p_flag &= ~P_PROTECTED; 59 p->p_flag2 &= ~P2_INHERIT_PROTECTED; 60 } 61 return (1); 62} 63 64static int 65protect_setchildren(struct thread *td, struct proc *top, int flags) 66{ 67 struct proc *p; 68 int ret; 69 70 p = top; 71 ret = 0; 72 sx_assert(&proctree_lock, SX_LOCKED); 73 for (;;) { 74 ret |= protect_setchild(td, p, flags); 75 PROC_UNLOCK(p); 76 /* 77 * If this process has children, descend to them next, 78 * otherwise do any siblings, and if done with this level, 79 * follow back up the tree (but not past top). 80 */ 81 if (!LIST_EMPTY(&p->p_children)) 82 p = LIST_FIRST(&p->p_children); 83 else for (;;) { 84 if (p == top) { 85 PROC_LOCK(p); 86 return (ret); 87 } 88 if (LIST_NEXT(p, p_sibling)) { 89 p = LIST_NEXT(p, p_sibling); 90 break; 91 } 92 p = p->p_pptr; 93 } 94 PROC_LOCK(p); 95 } 96} 97 98static int 99protect_set(struct thread *td, struct proc *p, int flags) 100{ 101 int error, ret; 102 103 switch (PPROT_OP(flags)) { 104 case PPROT_SET: 105 case PPROT_CLEAR: 106 break; 107 default: 108 return (EINVAL); 109 } 110 111 if ((PPROT_FLAGS(flags) & ~(PPROT_DESCEND | PPROT_INHERIT)) != 0) 112 return (EINVAL); 113 114 error = priv_check(td, PRIV_VM_MADV_PROTECT); 115 if (error) 116 return (error); 117 118 if (flags & PPROT_DESCEND) 119 ret = protect_setchildren(td, p, flags); 120 else 121 ret = protect_setchild(td, p, flags); 122 if (ret == 0) 123 return (EPERM); 124 return (0); 125} 126 127static int 128reap_acquire(struct thread *td, struct proc *p) 129{ 130 131 sx_assert(&proctree_lock, SX_XLOCKED); 132 if (p != curproc) 133 return (EPERM); 134 if ((p->p_treeflag & P_TREE_REAPER) != 0) 135 return (EBUSY); 136 p->p_treeflag |= P_TREE_REAPER; 137 /* 138 * We do not reattach existing children and the whole tree 139 * under them to us, since p->p_reaper already seen them. 140 */ 141 return (0); 142} 143 144static int 145reap_release(struct thread *td, struct proc *p) 146{ 147 148 sx_assert(&proctree_lock, SX_XLOCKED); 149 if (p != curproc) 150 return (EPERM); 151 if (p == initproc) 152 return (EINVAL); 153 if ((p->p_treeflag & P_TREE_REAPER) == 0) 154 return (EINVAL); 155 reaper_abandon_children(p, false); 156 return (0); 157} 158 159static int 160reap_status(struct thread *td, struct proc *p, 161 struct procctl_reaper_status *rs) 162{ 163 struct proc *reap, *p2, *first_p; 164 165 sx_assert(&proctree_lock, SX_LOCKED); 166 bzero(rs, sizeof(*rs)); 167 if ((p->p_treeflag & P_TREE_REAPER) == 0) { 168 reap = p->p_reaper; 169 } else { 170 reap = p; 171 rs->rs_flags |= REAPER_STATUS_OWNED; 172 } 173 if (reap == initproc) 174 rs->rs_flags |= REAPER_STATUS_REALINIT; 175 rs->rs_reaper = reap->p_pid; 176 rs->rs_descendants = 0; 177 rs->rs_children = 0; 178 if (!LIST_EMPTY(&reap->p_reaplist)) { 179 first_p = LIST_FIRST(&reap->p_children); 180 if (first_p == NULL) 181 first_p = LIST_FIRST(&reap->p_reaplist); 182 rs->rs_pid = first_p->p_pid; 183 LIST_FOREACH(p2, &reap->p_reaplist, p_reapsibling) { 184 if (proc_realparent(p2) == reap) 185 rs->rs_children++; 186 rs->rs_descendants++; 187 } 188 } else { 189 rs->rs_pid = -1; 190 } 191 return (0); 192} 193 194static int 195reap_getpids(struct thread *td, struct proc *p, struct procctl_reaper_pids *rp) 196{ 197 struct proc *reap, *p2; 198 struct procctl_reaper_pidinfo *pi, *pip; 199 u_int i, n; 200 int error; 201 202 sx_assert(&proctree_lock, SX_LOCKED); 203 PROC_UNLOCK(p); 204 reap = (p->p_treeflag & P_TREE_REAPER) == 0 ? p->p_reaper : p; 205 n = i = 0; 206 error = 0; 207 LIST_FOREACH(p2, &reap->p_reaplist, p_reapsibling) 208 n++; 209 sx_unlock(&proctree_lock); 210 if (rp->rp_count < n) 211 n = rp->rp_count; 212 pi = malloc(n * sizeof(*pi), M_TEMP, M_WAITOK); 213 sx_slock(&proctree_lock); 214 LIST_FOREACH(p2, &reap->p_reaplist, p_reapsibling) { 215 if (i == n) 216 break; 217 pip = &pi[i]; 218 bzero(pip, sizeof(*pip)); 219 pip->pi_pid = p2->p_pid; 220 pip->pi_subtree = p2->p_reapsubtree; 221 pip->pi_flags = REAPER_PIDINFO_VALID; 222 if (proc_realparent(p2) == reap) 223 pip->pi_flags |= REAPER_PIDINFO_CHILD; 224 if ((p2->p_treeflag & P_TREE_REAPER) != 0) 225 pip->pi_flags |= REAPER_PIDINFO_REAPER; 226 i++; 227 } 228 sx_sunlock(&proctree_lock); 229 error = copyout(pi, rp->rp_pids, i * sizeof(*pi)); 230 free(pi, M_TEMP); 231 sx_slock(&proctree_lock); 232 PROC_LOCK(p); 233 return (error); 234} 235 236static void 237reap_kill_proc(struct thread *td, struct proc *p2, ksiginfo_t *ksi, 238 struct procctl_reaper_kill *rk, int *error) 239{ 240 int error1; 241 242 PROC_LOCK(p2); 243 error1 = p_cansignal(td, p2, rk->rk_sig); 244 if (error1 == 0) { 245 pksignal(p2, rk->rk_sig, ksi); 246 rk->rk_killed++; 247 *error = error1; 248 } else if (*error == ESRCH) { 249 rk->rk_fpid = p2->p_pid; 250 *error = error1; 251 } 252 PROC_UNLOCK(p2); 253} 254 255struct reap_kill_tracker { 256 struct proc *parent; 257 TAILQ_ENTRY(reap_kill_tracker) link; 258}; 259 260TAILQ_HEAD(reap_kill_tracker_head, reap_kill_tracker); 261 262static void 263reap_kill_sched(struct reap_kill_tracker_head *tracker, struct proc *p2) 264{ 265 struct reap_kill_tracker *t; 266 267 t = malloc(sizeof(struct reap_kill_tracker), M_TEMP, M_WAITOK); 268 t->parent = p2; 269 TAILQ_INSERT_TAIL(tracker, t, link); 270} 271 272static int 273reap_kill(struct thread *td, struct proc *p, struct procctl_reaper_kill *rk) 274{ 275 struct proc *reap, *p2; 276 ksiginfo_t ksi; 277 struct reap_kill_tracker_head tracker; 278 struct reap_kill_tracker *t; 279 int error; 280 281 sx_assert(&proctree_lock, SX_LOCKED); 282 if (IN_CAPABILITY_MODE(td)) 283 return (ECAPMODE); 284 if (rk->rk_sig <= 0 || rk->rk_sig > _SIG_MAXSIG || 285 (rk->rk_flags & ~(REAPER_KILL_CHILDREN | 286 REAPER_KILL_SUBTREE)) != 0 || (rk->rk_flags & 287 (REAPER_KILL_CHILDREN | REAPER_KILL_SUBTREE)) == 288 (REAPER_KILL_CHILDREN | REAPER_KILL_SUBTREE)) 289 return (EINVAL); 290 PROC_UNLOCK(p); 291 reap = (p->p_treeflag & P_TREE_REAPER) == 0 ? p->p_reaper : p; 292 ksiginfo_init(&ksi); 293 ksi.ksi_signo = rk->rk_sig; 294 ksi.ksi_code = SI_USER; 295 ksi.ksi_pid = td->td_proc->p_pid; 296 ksi.ksi_uid = td->td_ucred->cr_ruid; 297 error = ESRCH; 298 rk->rk_killed = 0; 299 rk->rk_fpid = -1; 300 if ((rk->rk_flags & REAPER_KILL_CHILDREN) != 0) { 301 for (p2 = LIST_FIRST(&reap->p_children); p2 != NULL; 302 p2 = LIST_NEXT(p2, p_sibling)) { 303 reap_kill_proc(td, p2, &ksi, rk, &error); 304 /* 305 * Do not end the loop on error, signal 306 * everything we can. 307 */ 308 } 309 } else { 310 TAILQ_INIT(&tracker); 311 reap_kill_sched(&tracker, reap); 312 while ((t = TAILQ_FIRST(&tracker)) != NULL) { 313 MPASS((t->parent->p_treeflag & P_TREE_REAPER) != 0); 314 TAILQ_REMOVE(&tracker, t, link); 315 for (p2 = LIST_FIRST(&t->parent->p_reaplist); p2 != NULL; 316 p2 = LIST_NEXT(p2, p_reapsibling)) { 317 if (t->parent == reap && 318 (rk->rk_flags & REAPER_KILL_SUBTREE) != 0 && 319 p2->p_reapsubtree != rk->rk_subtree) 320 continue; 321 if ((p2->p_treeflag & P_TREE_REAPER) != 0) 322 reap_kill_sched(&tracker, p2); 323 reap_kill_proc(td, p2, &ksi, rk, &error); 324 } 325 free(t, M_TEMP); 326 } 327 } 328 PROC_LOCK(p); 329 return (error); 330} 331 332static int 333trace_ctl(struct thread *td, struct proc *p, int state) 334{ 335 336 PROC_LOCK_ASSERT(p, MA_OWNED); 337 338 /* 339 * Ktrace changes p_traceflag from or to zero under the 340 * process lock, so the test does not need to acquire ktrace 341 * mutex. 342 */ 343 if ((p->p_flag & P_TRACED) != 0 || p->p_traceflag != 0) 344 return (EBUSY); 345 346 switch (state) { 347 case PROC_TRACE_CTL_ENABLE: 348 if (td->td_proc != p) 349 return (EPERM); 350 p->p_flag2 &= ~(P2_NOTRACE | P2_NOTRACE_EXEC); 351 break; 352 case PROC_TRACE_CTL_DISABLE_EXEC: 353 p->p_flag2 |= P2_NOTRACE_EXEC | P2_NOTRACE; 354 break; 355 case PROC_TRACE_CTL_DISABLE: 356 if ((p->p_flag2 & P2_NOTRACE_EXEC) != 0) { 357 KASSERT((p->p_flag2 & P2_NOTRACE) != 0, 358 ("dandling P2_NOTRACE_EXEC")); 359 if (td->td_proc != p) 360 return (EPERM); 361 p->p_flag2 &= ~P2_NOTRACE_EXEC; 362 } else { 363 p->p_flag2 |= P2_NOTRACE; 364 } 365 break; 366 default: 367 return (EINVAL); 368 } 369 return (0); 370} 371 372static int 373trace_status(struct thread *td, struct proc *p, int *data) 374{ 375 376 if ((p->p_flag2 & P2_NOTRACE) != 0) { 377 KASSERT((p->p_flag & P_TRACED) == 0, 378 ("%d traced but tracing disabled", p->p_pid)); 379 *data = -1; 380 } else if ((p->p_flag & P_TRACED) != 0) { 381 *data = p->p_pptr->p_pid; 382 } else { 383 *data = 0; 384 } 385 return (0); 386} 387 388static int 389trapcap_ctl(struct thread *td, struct proc *p, int state) 390{ 391 392 PROC_LOCK_ASSERT(p, MA_OWNED); 393 394 switch (state) { 395 case PROC_TRAPCAP_CTL_ENABLE: 396 p->p_flag2 |= P2_TRAPCAP; 397 break; 398 case PROC_TRAPCAP_CTL_DISABLE: 399 p->p_flag2 &= ~P2_TRAPCAP; 400 break; 401 default: 402 return (EINVAL); 403 } 404 return (0); 405} 406 407static int 408trapcap_status(struct thread *td, struct proc *p, int *data) 409{ 410 411 *data = (p->p_flag2 & P2_TRAPCAP) != 0 ? PROC_TRAPCAP_CTL_ENABLE : 412 PROC_TRAPCAP_CTL_DISABLE; 413 return (0); 414} 415 416static int 417stackgap_ctl(struct thread *td, struct proc *p, int state) 418{ 419 PROC_LOCK_ASSERT(p, MA_OWNED); 420 421 if ((state & ~(PROC_STACKGAP_ENABLE | PROC_STACKGAP_DISABLE | 422 PROC_STACKGAP_ENABLE_EXEC | PROC_STACKGAP_DISABLE_EXEC)) != 0) 423 return (EINVAL); 424 switch (state & (PROC_STACKGAP_ENABLE | PROC_STACKGAP_DISABLE)) { 425 case PROC_STACKGAP_ENABLE: 426 if ((p->p_flag2 & P2_STKGAP_DISABLE) != 0) 427 return (EINVAL); 428 break; 429 case PROC_STACKGAP_DISABLE: 430 p->p_flag2 |= P2_STKGAP_DISABLE; 431 break; 432 case 0: 433 break; 434 default: 435 return (EINVAL); 436 } 437 switch (state & (PROC_STACKGAP_ENABLE_EXEC | 438 PROC_STACKGAP_DISABLE_EXEC)) { 439 case PROC_STACKGAP_ENABLE_EXEC: 440 p->p_flag2 &= ~P2_STKGAP_DISABLE_EXEC; 441 break; 442 case PROC_STACKGAP_DISABLE_EXEC: 443 p->p_flag2 |= P2_STKGAP_DISABLE_EXEC; 444 break; 445 case 0: 446 break; 447 default: 448 return (EINVAL); 449 } 450 return (0); 451} 452 453static int 454stackgap_status(struct thread *td, struct proc *p, int *data) 455{ 456 PROC_LOCK_ASSERT(p, MA_OWNED); 457 458 *data = (p->p_flag2 & P2_STKGAP_DISABLE) != 0 ? PROC_STACKGAP_DISABLE : 459 PROC_STACKGAP_ENABLE; 460 *data |= (p->p_flag2 & P2_STKGAP_DISABLE_EXEC) != 0 ? 461 PROC_STACKGAP_DISABLE_EXEC : PROC_STACKGAP_ENABLE_EXEC; 462 return (0); 463} 464 465#ifndef _SYS_SYSPROTO_H_ 466struct procctl_args { 467 idtype_t idtype; 468 id_t id; 469 int com; 470 void *data; 471}; 472#endif 473/* ARGSUSED */ 474int 475sys_procctl(struct thread *td, struct procctl_args *uap) 476{ 477 void *data; 478 union { 479 struct procctl_reaper_status rs; 480 struct procctl_reaper_pids rp; 481 struct procctl_reaper_kill rk; 482 } x; 483 int error, error1, flags, signum; 484 485 switch (uap->com) { 486 case PROC_SPROTECT: 487 case PROC_STACKGAP_CTL: 488 case PROC_TRACE_CTL: 489 case PROC_TRAPCAP_CTL: 490 error = copyin(uap->data, &flags, sizeof(flags)); 491 if (error != 0) 492 return (error); 493 data = &flags; 494 break; 495 case PROC_REAP_ACQUIRE: 496 case PROC_REAP_RELEASE: 497 if (uap->data != NULL) 498 return (EINVAL); 499 data = NULL; 500 break; 501 case PROC_REAP_STATUS: 502 data = &x.rs; 503 break; 504 case PROC_REAP_GETPIDS: 505 error = copyin(uap->data, &x.rp, sizeof(x.rp)); 506 if (error != 0) 507 return (error); 508 data = &x.rp; 509 break; 510 case PROC_REAP_KILL: 511 error = copyin(uap->data, &x.rk, sizeof(x.rk)); 512 if (error != 0) 513 return (error); 514 data = &x.rk; 515 break; 516 case PROC_STACKGAP_STATUS: 517 case PROC_TRACE_STATUS: 518 case PROC_TRAPCAP_STATUS: 519 data = &flags; 520 break; 521 case PROC_PDEATHSIG_CTL: 522 error = copyin(uap->data, &signum, sizeof(signum)); 523 if (error != 0) 524 return (error); 525 data = &signum; 526 break; 527 case PROC_PDEATHSIG_STATUS: 528 data = &signum; 529 break; 530 default: 531 return (EINVAL); 532 } 533 error = kern_procctl(td, uap->idtype, uap->id, uap->com, data); 534 switch (uap->com) { 535 case PROC_REAP_STATUS: 536 if (error == 0) 537 error = copyout(&x.rs, uap->data, sizeof(x.rs)); 538 break; 539 case PROC_REAP_KILL: 540 error1 = copyout(&x.rk, uap->data, sizeof(x.rk)); 541 if (error == 0) 542 error = error1; 543 break; 544 case PROC_STACKGAP_STATUS: 545 case PROC_TRACE_STATUS: 546 case PROC_TRAPCAP_STATUS: 547 if (error == 0) 548 error = copyout(&flags, uap->data, sizeof(flags)); 549 break; 550 case PROC_PDEATHSIG_STATUS: 551 if (error == 0) 552 error = copyout(&signum, uap->data, sizeof(signum)); 553 break; 554 } 555 return (error); 556} 557 558static int 559kern_procctl_single(struct thread *td, struct proc *p, int com, void *data) 560{ 561 562 PROC_LOCK_ASSERT(p, MA_OWNED); 563 switch (com) { 564 case PROC_SPROTECT: 565 return (protect_set(td, p, *(int *)data)); 566 case PROC_STACKGAP_CTL: 567 return (stackgap_ctl(td, p, *(int *)data)); 568 case PROC_STACKGAP_STATUS: 569 return (stackgap_status(td, p, data)); 570 case PROC_REAP_ACQUIRE: 571 return (reap_acquire(td, p)); 572 case PROC_REAP_RELEASE: 573 return (reap_release(td, p)); 574 case PROC_REAP_STATUS: 575 return (reap_status(td, p, data)); 576 case PROC_REAP_GETPIDS: 577 return (reap_getpids(td, p, data)); 578 case PROC_REAP_KILL: 579 return (reap_kill(td, p, data)); 580 case PROC_TRACE_CTL: 581 return (trace_ctl(td, p, *(int *)data)); 582 case PROC_TRACE_STATUS: 583 return (trace_status(td, p, data)); 584 case PROC_TRAPCAP_CTL: 585 return (trapcap_ctl(td, p, *(int *)data)); 586 case PROC_TRAPCAP_STATUS: 587 return (trapcap_status(td, p, data)); 588 default: 589 return (EINVAL); 590 } 591} 592 593int 594kern_procctl(struct thread *td, idtype_t idtype, id_t id, int com, void *data) 595{ 596 struct pgrp *pg; 597 struct proc *p; 598 int error, first_error, ok; 599 int signum; 600 bool tree_locked; 601 602 switch (com) { 603 case PROC_REAP_ACQUIRE: 604 case PROC_REAP_RELEASE: 605 case PROC_REAP_STATUS: 606 case PROC_REAP_GETPIDS: 607 case PROC_REAP_KILL: 608 case PROC_STACKGAP_CTL: 609 case PROC_STACKGAP_STATUS: 610 case PROC_TRACE_STATUS: 611 case PROC_TRAPCAP_STATUS: 612 case PROC_PDEATHSIG_CTL: 613 case PROC_PDEATHSIG_STATUS: 614 if (idtype != P_PID) 615 return (EINVAL); 616 } 617 618 switch (com) { 619 case PROC_PDEATHSIG_CTL: 620 signum = *(int *)data; 621 p = td->td_proc; 622 if ((id != 0 && id != p->p_pid) || 623 (signum != 0 && !_SIG_VALID(signum))) 624 return (EINVAL); 625 PROC_LOCK(p); 626 p->p_pdeathsig = signum; 627 PROC_UNLOCK(p); 628 return (0); 629 case PROC_PDEATHSIG_STATUS: 630 p = td->td_proc; 631 if (id != 0 && id != p->p_pid) 632 return (EINVAL); 633 PROC_LOCK(p); 634 *(int *)data = p->p_pdeathsig; 635 PROC_UNLOCK(p); 636 return (0); 637 } 638 639 switch (com) { 640 case PROC_SPROTECT: 641 case PROC_REAP_STATUS: 642 case PROC_REAP_GETPIDS: 643 case PROC_REAP_KILL: 644 case PROC_TRACE_CTL: 645 case PROC_TRAPCAP_CTL: 646 sx_slock(&proctree_lock); 647 tree_locked = true; 648 break; 649 case PROC_REAP_ACQUIRE: 650 case PROC_REAP_RELEASE: 651 sx_xlock(&proctree_lock); 652 tree_locked = true; 653 break; 654 case PROC_STACKGAP_CTL: 655 case PROC_STACKGAP_STATUS: 656 case PROC_TRACE_STATUS: 657 case PROC_TRAPCAP_STATUS: 658 tree_locked = false; 659 break; 660 default: 661 return (EINVAL); 662 } 663 664 switch (idtype) { 665 case P_PID: 666 p = pfind(id); 667 if (p == NULL) { 668 error = ESRCH; 669 break; 670 } 671 error = p_cansee(td, p); 672 if (error == 0) 673 error = kern_procctl_single(td, p, com, data); 674 PROC_UNLOCK(p); 675 break; 676 case P_PGID: 677 /* 678 * Attempt to apply the operation to all members of the 679 * group. Ignore processes in the group that can't be 680 * seen. Ignore errors so long as at least one process is 681 * able to complete the request successfully. 682 */ 683 pg = pgfind(id); 684 if (pg == NULL) { 685 error = ESRCH; 686 break; 687 } 688 PGRP_UNLOCK(pg); 689 ok = 0; 690 first_error = 0; 691 LIST_FOREACH(p, &pg->pg_members, p_pglist) { 692 PROC_LOCK(p); 693 if (p->p_state == PRS_NEW || p_cansee(td, p) != 0) { 694 PROC_UNLOCK(p); 695 continue; 696 } 697 error = kern_procctl_single(td, p, com, data); 698 PROC_UNLOCK(p); 699 if (error == 0) 700 ok = 1; 701 else if (first_error == 0) 702 first_error = error; 703 } 704 if (ok) 705 error = 0; 706 else if (first_error != 0) 707 error = first_error; 708 else 709 /* 710 * Was not able to see any processes in the 711 * process group. 712 */ 713 error = ESRCH; 714 break; 715 default: 716 error = EINVAL; 717 break; 718 } 719 if (tree_locked) 720 sx_unlock(&proctree_lock); 721 return (error); 722} 723